Rotation, sometimes called rotation pool, 15-ball rotation, or 61, is a pool game, played with a billiards table, , and triangular rack of fifteen billiard balls, in which the lowest-numbered on the table must be always struck by the cue ball first, to attempt to numbered balls for . Some attractions of rotation include performing unconventional or difficult shots to reach the correct ball, and quite often making risky attempts to score higher numbers of points by performing advanced shots such as , , and . Rules Object The object of the game is to score the most points, by pocketing higher-scoring balls than the opponent(s). A (individual game) is won when a player or team reaches a number of points (usually 61) that makes it impossible for the opponent(s) to win. A may consist of multiple frames (e.g. a ), or in multiple of multiple frames (e.g. three rounds of best 2-out-of-three), as in other types of pool. Scoring Points are scored by pocketing the object balls on the table; the number of points awarded is equal to the number printed on the ball pocketed; for example, pocketing the 4 ball scores the player 4 points. In a two-player (or two-team) game, the frame is over when a player or team has at least 61 points, one more than half the number of available points. Games tied at 60 points can occur, in which case the player who last legally pocketed a ball is credited with a bonus point and declared the winner. More than two players or teams can play, with the winning score being whatever number will mathematically eliminate other players from outscoring the leader. Set up At the beginning of each frame, the balls are in a triangle as in eight-ball and other games using fifteen object balls, but in particular with the 1 ball at the front (apex) of the rack, on the , the 2 ball on the right rear corner (from the vantage of the racker) and the 3 ball at the left rear corner (as in kelly pool), and the 15 ball – the one with the highest value – in the center; all other balls are placed randomly, and all balls must be touching. In informal British play, it is common to push the rack forward farther so that the 15 ball, still in the center of the rack, is resting